Multiple condenser



May 7, 1929. c. PFANSTIEHL MULTIPLE CONDENSER Filed July 20, 1925 WN mm, EN@ Rw QQ Patented .May 7, 1929.

l I uruTreD` STATES MTENT OFFICE.

CARL TFANSTIEHL, oF IIIGHLAND I'ABK, ILLINoIs, AssIGNoR, BY MESNE ASSIGN- MENTS, To NATIONAL ELECTRICAL PRODUCTS COMPANY, oF WAUITEGAN, ILLI- NOIS, A CORPORATION OF ILLlNOIS.

MULTIQPLE CONDENSER.

Application led July 20, 1 925. Serial No.,44,804.

This invention relates to lnultiple condensers and the like and is particularly adaptedto be used in radio receiving sets having one or more stages of radio frequency amplitcation. scribed4 in the following specification and shown in the accompanying drawings, in which lFigure l ista front elevation of acondenser embodying the invention;

Fig. 2 is',a topfplan View of the same; .and I Figs. 3 and 4 are partially enlarged transverse sections on the Fig. 2. y

The embodiment. illustrated comprises a multiple condenser having a frame composed of metal sides 10 and 11 spaced apart by means of screws 12 threaded into spacer posts 13.

Between the sides 10 and lllare mounted three variable condensers, C, D, and F. .Each lcond'enser has4 a series of parallel spaced metal stator plates le which are.

Y notched at 15 and 16 to fit into notches 17 on metal pins 18, the latter being retained by porcelain caps 19 which are shouldered at 20 to pass into holes 2l in the side plates l() and 11. Thus the stator plates are allin sul-ated from the met-al side platesfby means ot porcelain caps 19.

rlhe rotor plates 22 dt condensers and D are mounted upon shafts 23 which are journaled in the metal side plates 10 and ll so that they are always`in electrical contact therewith. The roto'i` plates 224 have the same spacing as the stator plates le, onerot the rotor ,plates passing between each of the adjacentpair ot' stator plates as shown in Fig. 2. Y

' he rotor .plates 2t ot condenser E are carried by ashatt 25 which, as shown -in Fig. 3 is journaled in an 'insulating block 26 which insulates it tromthe side' plate ll `and in an insulating block 2T `which insulates it from the side plate'ltl.

Thus lthe condensers C and D' have their rotor plates electrically connected te the meta-l side yplates 10 and ll vvhile the rotor plates '2l ot the condenser E, a'svvell asthe stator plates 2st, are electrically insulated trpm the side plates for a purpose which vvlll hereinafter appears The invention is fully de lines 3-3 and 4--1 ot shaft 25 is providedwith a. bell crank 29 ofthe same shape and dimensions but of insulating material. These bell cranks are also set at the same atngle and are pivotally connected by means of side rods 30 and 3 1 which operate on `suit-able pins 32 and From the foregoing .it will be understood that by making the rotor plates 22'and 24; ident-ical in size and shape and setting them at the same angle With respect to the bell cranks the capacities of all tlnee'condens'ers will be substantially the same vfor any given position of the movable plates.

ll-'hile l have shovvn and described certain embodiments ofmy invention, it is to be understood that it is capable of many modifications. Chznges, therefore, in the construction and arrangement may be made Without-'departing from the spirit and scope of. the invention asdisclosed in the appended claims.

lt claim 2A l. ln a` multiple condenser, spaced side plates, a plurality of sets ofspaced parallel stator plates carried between said side plates and insulated therefrom, a set of rotor plates carriedby said side plates in capacitative relation to each set ot stator plates, one ot said sets ot rotor plates being insulated from the side plates and the remaining rotor plates being" "1n electrical Contact with said side plates, and )means for simultaneously and substantially equally varying the capacit-ies et said condensers.

2. lln a multiple condenser, spaced side plates, a plurality ot sets ot-spaced parallel stator plates'carried between said side plates and insulated theretromy'a set lof' rotor plates carried. by said side plates in capaciplates, and side reds connecting said bell cranks for siniultaneously and substantially equally varying the capacities of said condensers.

\ 3. In a multiple condenser, spaced7 side plates, a plurality of sets of spaced parallelv stator plates carried between saidside plates and insulated therefrom, a set oi rotorV ing,` rotor plates being in electrical, Contact with -said side plates, bell eranks 'on said 'rotor plates, and side rods connectinff said bell cranks forl simultaneously and substan tially equally varying the capacities of said `eondensers, one of said bell cranks being made of an insulating material.

In testimony whereof I have hereunto set my hand this 11th day of July, 1925.

CARL PFANSTIEHL. 

